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Lucerne for sheep
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<blockquote data-quote="Derrick Hughes" data-source="post: 7529771" data-attributes="member: 473"><p>IBERS Legumes and Fertility Review </p><p></p><p>Permanent infertility </p><p>When ewes are exposed to high oestrogen red clover for prolonged periods permanent </p><p>infertility may occur. Clover infertility results in permanent damage to the reproductive tract </p><p>which becomes worse with each year‟s exposure to oestrogenic pastures .The oestrogen affects the structure of the cervix and sperm transport and conception </p><p>rates are reduced (Lightfoot et al., 1973). There are often no visual signs that ewes are </p><p>suffering from permanent infertility as ovarian function remains normal and ewes will show </p><p>normal oestrous cycles (Adams, 1995). The lack of visual signs means that the condition </p><p>often goes unnoticed and it is estimated that in Australia 1 million ewes may be affected and </p><p>that, on average, affected flocks have around a 10% increase in non-pregnant ewes </p><p>(Adams, 1990). Diagnosis of the problem is difficult and depends primarily on detection of </p><p>pathological changes in the cervix, which is normally identified on material collected from </p><p>ewes at abattoirs, rather than history or clinical signs.</p><p>Temporary infertility </p><p>Ewes fed high oestrogen red clover may suffer temporary infertility that will normally resolve </p><p>within one month after cessation of grazing (Adams 1995). As in permanent infertility, ewes </p><p>will exhibit normal oestrus cycles, although some breeds of ewe develop swelling of the </p><p>vulva and development of the mammary glands. Some breeds have a tendency to exhibit </p><p>visual signs more frequently than others but absence of visual signs is common in certain </p><p>breeds (e.g., Merino ewes) (Adams, 1995). An accurate diagnosis of temporary infertility </p><p>depends on the oestrogen concentration in the pasture at the time the sheep are being </p><p>mated (Adams, 1995).</p></blockquote><p></p>
[QUOTE="Derrick Hughes, post: 7529771, member: 473"] IBERS Legumes and Fertility Review Permanent infertility When ewes are exposed to high oestrogen red clover for prolonged periods permanent infertility may occur. Clover infertility results in permanent damage to the reproductive tract which becomes worse with each year‟s exposure to oestrogenic pastures .The oestrogen affects the structure of the cervix and sperm transport and conception rates are reduced (Lightfoot et al., 1973). There are often no visual signs that ewes are suffering from permanent infertility as ovarian function remains normal and ewes will show normal oestrous cycles (Adams, 1995). The lack of visual signs means that the condition often goes unnoticed and it is estimated that in Australia 1 million ewes may be affected and that, on average, affected flocks have around a 10% increase in non-pregnant ewes (Adams, 1990). Diagnosis of the problem is difficult and depends primarily on detection of pathological changes in the cervix, which is normally identified on material collected from ewes at abattoirs, rather than history or clinical signs. Temporary infertility Ewes fed high oestrogen red clover may suffer temporary infertility that will normally resolve within one month after cessation of grazing (Adams 1995). As in permanent infertility, ewes will exhibit normal oestrus cycles, although some breeds of ewe develop swelling of the vulva and development of the mammary glands. Some breeds have a tendency to exhibit visual signs more frequently than others but absence of visual signs is common in certain breeds (e.g., Merino ewes) (Adams, 1995). An accurate diagnosis of temporary infertility depends on the oestrogen concentration in the pasture at the time the sheep are being mated (Adams, 1995). [/QUOTE]
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